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The Folding Phoropter


FOLDING PHOROPTER

Democratizing access to refractive error screening

Update: We are in the top five of the Clearly Vision Prize!

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The Folding Phoropter


FOLDING PHOROPTER

Democratizing access to refractive error screening

Update: We are in the top five of the Clearly Vision Prize!

The Folding Phoropter is a novel device developed by the Srujana Center for Innovation, L V Prasad Eye Institute, Hyderabad to combat the disproportionate access to tools for screening for refractive error in low resource areas. This device is extremely low-cost, disposable, easy to assemble and open-source, which means anyone can build their own following the instructions.

Inspired by Dr Manu Prakash's "Foldscope" and the Google cardboard, we re-imagined a phoropter into the most basic screening device which could be easily and scalably fabricated, improved upon and used for the betterment of eyecare. Get involved! Send a mail to ashishjain [AT] lvpei.org or joshi [AT] lvpei.org

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THE PROBLEM


THE PROBLEM

More than 2.3 billion people in the world suffer from poor vision due to refractive errors (REs). Uncorrected REs are the largest cause of avoidable blindness in the developing world.

THE PROBLEM


THE PROBLEM

More than 2.3 billion people in the world suffer from poor vision due to refractive errors (REs). Uncorrected REs are the largest cause of avoidable blindness in the developing world.

In 2010, WHO estimated that 153 million people worldwide were visually impaired due to uncorrected REs. Visual impairment can have immediate and long-term consequences in children and adults, such as lost educational and employment opportunities, and impaired quality of life. REs can simply be diagnosed, measured, and corrected with the aid of optical corrective approaches and devices such as spectacles and contact lenses or by refractive surgical procedures. Despite this, an estimated 670 million people worldwide do not have spectacles or adequate correction, including 517 million with near vision impairment and 153 million with distance vision impairment. Of 517 million people without spectacles for near vision correction, 410 million are deterred from performing near vision tasks and activities. Current data suggests that more than 90% of people with uncorrected REs worldwide reside in rural and low-income countries.

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Our Solution


OUR SOLUTION

Our Solution


OUR SOLUTION

A simple device made using origami. Using our data-driven approach, we have calibrated this device on the most commonly observed refractive error ranges. Easy to understand, intuitive to use. 

USABLE BY ALL

The lenses need to be placed in their designated positions and fold along the lines. The two parts line up inside one another, resembling a telescope. The patient needs to look through the device a fixed distance away from the designated target, and move the outer chamber inwards until the image just comes into focus.

RELIABLE PREDICTIONS OF REFRACTIVE ERROR

We collected data from 100 subjects and measured their refractive error using our device, subjective refraction and objective refraction at the clinic. The adjoining plot shows the comparison between our device's readings and the gold standard (taken as ground truth). Patient data is represented by opaque dots (darker color indicates overlapping of multiple samples with the same measurements). The line of best fit and the standard error of the mean are represented by the blue line and gray shade, respectively. There is a strong correlation between JULIA readings and standard readings (Pearson correlation: rho = 0.8, p < 1e-16). 

EASY TO ASSEMBLE

Our device is extremely easy to assemble, it can be put together in a matter of minutes without prior training. Simple origami is needed, similar to folding a takeaway parcel box or an envelope.